Sfermion

In particle physics, a sfermion is any of the class of spin-0 superpartners of ordinary fermions appearing in supersymmetric extensions to the Standard Model. Thus, the sfermions include the squarks and the sleptons.

Fundamental sfermions

quark

Squark is a hypothetical boson superpartner of a quark whose existence is implied by supersymmetry.

lepton

Slepton is a hypothetical boson superpartner of a lepton whose existence is implied by supersymmetry. Sleptons have the same flavour and electric charge as corresponding leptons and their spin is zero. In an exactly supersymmetric world they also must have the same mass, but thus far such a particle has not been observed. If they exist, supersymmetry must be broken and their mass is beyond current experimental reach.

Examples include
*selectron, which is superpartner of an electron
*smuon, which is superpartner of an muon
*stau, which is superpartner of an tau lepton
*sneutrino, which is superpartners of an neutrino.

ee also

*Minimal Supersymmetric Standard Model